fix(deps): update module github.com/go-gfx/gfx to v0.19.0

[tannevaled]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/go-gfx/gfx	v0.16.0 → v0.19.0

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Release Notes

go-gfx/gfx (github.com/go-gfx/gfx)

v0.19.0

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v0.18.0

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v0.17.0: — a TIFF that is not eighteen times too big

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tiff.Encode was passed nil options, which reads like "no options" and means "no compression". On a page-sized picture that is 7 755 458 bytes against 415 493 with Deflate — eighteen times.

It was found downstream. go-pdfkit/app added a format chooser for handing a drawn page over and measured what each costs over 40 real documents: GIF 105 kB, JPEG 129 kB, PNG 209 kB — against BMP 4.9 MB and TIFF 6.6 MB. The ratio between those two is exactly four bytes a pixel against three, the alpha channel TIFF carries: both were the raw raster.

Deflate is compression 8, which every reader written this century takes. LZW would be the other candidate and this library cannot write it — tiff.Encode refuses it.

BMP stays large, and now says so. BMP has no compression to ask for; the documentation says it rather than leaving somebody to find out on a document of two hundred pages, and a test asserts it, so a BMP encoder that one day learns to compress makes what is written here fail rather than merely become untrue.

The compressed file is read back and compared pixel for pixel. A smaller file nothing opens is worse than a large one.

100% statement coverage, go vet and -race clean, nine cross-compile targets, CGO-free.

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